12 Mar
2003
12 Mar
'03
6:53 p.m.
From: "Jim Kearney" <jim(a)jkearney.com>
Hi Jim
This is what Eric Smith tells me as well. As I told
him, it doesn't make much sense. The board has a 6502
as well as the 6507 with the data lines tied together.
I guess they could use opposite phases or something.
I was tracing down the sync signals for the video
and they seem to be coming from this part??
I do have a schematic someplace but I haven't located
it yet.
Now I have a mystery to solve?
Dwight
From: "Dwight K. Elvey"
<dwightk.elvey(a)amd.com>
I'm looking for a data sheet for the Synertek 6507.
This is not the same as the reduced pin 6502's of the
same number by other manufactures. This is a video control
chip. If anyone has an old Synertek book with the
programming information for one of these I'd like
to get a photo copy??
According to my 1983 Synertek book, the SY6507 _is_ a 28-pin 65xx CPU with
8K addressing. The only video controllers they list are the SY6545, SY6845,
SY66450 and SY66550.